Dean, it's called "snapping." I'll bet it's always go to the right, hm? Well, first reduce the throw or just don't go full UP on the elevator--or it will happen all the time. Several of my airframes seem to have that bad habit. I've never tried mixing, but the amount of rudder needed to CORRECT the snap is like... equal to one click, but it depends on speed, wind direction, and amount of rudder input up.

I've tried using carbon fiber rods. No help.

If you find an answer, let me know. Every one of my 8 Twists did it, some less, some more.

J